package com.hxzy.filter;

import com.alibaba.fastjson.JSON;
import com.hxzy.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();// /backend/index.html
        log.info("拦截到的请求:{}",requestURI);

        //2.定义不需要处理的请求路径
        String[] urls = new String[]{
                "/users/login",
                "/users/logout",
                "/js/**",
                "/css/**",
                "/page/**",
                "/api/**",
                "/img/**",
                "/plugins/**"
        };

        //3.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //4.如果不需要处理，则直接放行
        if (check){
            log.info("不需要处理的请求:{}",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //5.判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已经登录，用户id为:{}",request.getSession().getAttribute("user"));
            filterChain.doFilter(request,response);
            return;
        }
        //6、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    @Override
    public void destroy() {

    }

    /*
     * @Method  check(String[] , String )
     * @Description 路径匹配
     * @Date 19:35 2023/4/11
     * @Param [urls, requestUrl]
     * @return boolean
     **/
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}